Organic Light Emitting Display Device Threshold Voltage Compensation
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Solution Overview
Problem
High-resolution organic light emitting display devices face challenges in maintaining sufficient threshold voltage compensation time due to rapid data signal switching, leading to display defects like mura and image quality degradation.
Innovation Solution
The organic light emitting display device incorporates a connection controller that manages the overlap of gate and connection control signals to ensure sufficient threshold voltage compensation time for driving transistors, using a configuration where first and second pixel groups receive alternating gate signals and data lines, allowing for partial overlap of compensation periods to prevent image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of the organic light emitting display device is increased, then the display quality is improved, but the threshold voltage compensation time is reduced due to rapid switching of data signals by the demultiplexer
Solution Approach 1:
The pixel groups are divided into first and second pixel groups that are driven by different gate signals (first group gate signal and second group gate signal). This segmentation allows independent control of compensation timing for each group, enabling the first pixel group to perform compensation during the period when the second pixel group is being driven, thus maintaining sufficient compensation time even with rapid demultiplexer switching.
2Device complexity
If the data writing period is divided into N portions by the demultiplexer, then the number of output channels of the data driver is reduced, but the threshold voltage compensation time becomes insufficient due to rapid switching
Solution Approach 1:
The first pixel group performs threshold voltage compensation in advance during the period when the second pixel group is receiving data signals. By preparing the compensation beforehand and utilizing the time when the other group is being driven, the system ensures sufficient compensation time is allocated without extending the overall data writing period or requiring additional output channels.
3Device complexity
If gate signals are provided sequentially to all pixel groups, then the device complexity is reduced, but the threshold voltage compensation time is insufficient for high-resolution displays
Solution Approach 1:
While the first pixel group is performing threshold voltage compensation, the second pixel group simultaneously receives data signals. This continuous utilization of time resources ensures that compensation operations for one group do not interfere with the data writing of another group, maintaining sufficient compensation time without requiring a more complex gate signal control structure that would sequentially service all groups.
Data Source
AI summary
An organic light emitting display device includes: a display panel including a plurality of pixel rows each including first pixel groups alternating with second pixel groups; a gate driver configured to provide a first group gate signal to the first pixel groups, and to provide a second group gate signal to the second pixel groups; a data driver configured to output data voltages to a plurality of output line groups; and a connection controller configured to connect the output line groups to a first data line group in response to a first connection control signal, and to connect the output line groups to a second data line group in response to a second connection control signal.